amit hadke created DRILL-4163:
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Summary: Support Schema changes for Merge Join
Key: DRILL-4163
URL: https://issues.apache.org/jira/browse/DRILL-4163
Project: Apache Drill
Issue Type: Improvement
Reporter: amit hadke
Assignee: amit hadke
Since External sort supports schema changes enable use of union types in merge
join to allow support for schema changes.
For now, we assume that merge join always works on record batches from sort
operator. Thus merging schemas and promoting to union vectors is already taken
care by sort operator.
Test Cases:
1) Only one side changes schema (join on union type and primitive type)
2) Both sids change schema on all columns.
3) Join between numeric types and string types.
4) Missing columns - each batch has different columns.
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